code: def testOne(self):
      output = self.helper([1234.0])
  
      self.assertEqual(output[0], 1)
      self.assertEqual(output[1], 1234.0)
  
file_path: essentia/test/src/unittests/sfx/test_derivativesfx_streaming.py
imports: from essentia_test import *
  from essentia.streaming import DerivativeSFX
label_desc: Use image node_id 3 for calling the TestDerivativeSfx_Streaming obj's underlying member method code with example usage: obj.testOne() without return types